Socks are another top seller. Here are the top-selling apparel items on Amazon.com last year, according to One Click Retail.

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Amazon's clothing and accessory sales are expected to grow nearly 30% this year, to $28 billion, according to Cowen & Co. Macy's apparel sales, by comparison, are expected to drop 4%, to $22 billion, in the period.

By 2021, Cowen expects Amazon to generate $62 billion in annual apparel sales. TJ Maxx is expected to be the No. 2 clothing seller, with $26 billion in sales, and Macy's is expected to claim the No. 3 spot, with $23 billion in sales.

A majority of customers still prefer to shop in department stores over Amazon for clothing, shoes, and accessories, however.

A recent survey by Cowen found that nearly 18% of consumers prefer to shop for those items on Amazon, compared to 40% who prefer to visit department stores.

The company has also hired executives from luxury fashion companies, such as Julie Gilhart, the Barneys New York fashion director whom Amazon reportedly hired as a consultant, and Vogue editor Caroline Palmer.

Also in the past few years, Amazon has started to shift its fashion strategy toward offering more high-end designer names such as Zac Posen and Stuart Weitzman.